A potentiometer wire AB has a length 0.5, and resistacne `0.5Omega`. AS shown in the diagram, it is connected with a cell of e.m.f 3V and a combination of resistance `R=S=5Omega`. Fin the potential dropt per unti length of the wire.

A potentiometer wire of length 100 cm has a resistance of 10 ohm. It is connected in series with a resistance and a battery of emf 2V and of negligible internal resistance. A source of emf 10mV is balanced against a length of 40 cm of the potentiometer wire. What is the value of the external resistance?

A potentiometer wire is of length 10 m and has a total resistance of 18 ohm. It carries a current of 120 mA. What length of it will be necessary to balance a cell of emf 1.5 volt ?

A 1.5 V cell is connected across a 3Omega resistance. Find the number of electrons coming out of the negative terminal of the cell In 5 minutes.